Inhibition of PGM Slag Loss in Copper smelting process

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An experimental study was carried out to determine the distribution of precious metals (gold, platinum, palladium, rhodium, and ruthenium) between copper matte and FeO_x-SiO_2 slag phases and the solubility of platinum in FeO_x-SiO_2 slag. The distribution ratios of precious metals were measured at 1300℃ and a fixed partial pressure of SO_2 of 0.1 atm for the matte grades between 40 and 70 mass% of copper. It was found that the distribution ratios are around 10^<-2> for ruthenium, 10^<-3> for gold and platinum and palladium and 10^<-4> for rhodium. In addition, platinum solubility in the FeO_x-SiO_2 slag equilibrated with the Cu-Pt binary alloy has been investigated at 1300℃. The platinum solubility in the slag decreases with decreasing copper content in the slag. The reduction of the copper loss leads inhibition of the PGM loss in the slag.